Solution composition for surface treatment of steel sheet, galvanized steel sheet surface-treated using the same, and method for producing the same

摘要

The present invention provides: a solution composition for steel sheet surface treatment, the solution composition containing 30-60 wt% of a trivalent chromium compound including chromium phosphate (A) and chromium nitrate (B), 0.2-0.4 wt% of a rust-inhibiting and corrosion-resisting agent, 0.1-0.3 wt% of a molybdenum-based compound, 5-10 wt% of a water-soluble cationic urethane resin, 0.5-2.0 wt% of a silane coupling agent, and 27.3-64.2 wt% of water; a zinc-based plated steel sheet surface-treated with the solution composition; and a manufacturing method for the steel sheet, wherein the zinc-based plated steel sheet treated with the solution composition for steel sheet surface treatment containing trivalent chromium has excellent effects in terms of corrosion resistance, blackening resistance, fingerprint resistance, oil resistance, and alkali resistance.